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Finding the Fourth Proportional to 813.50, 1,218.72 and 402.16

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Solution

The fourth proportional to 813.50, 1,218.72 and 402.16 is: 602.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.50 : 1,218.72 = 402.16 : x
  2. Step 2: Convert to fraction form
    813.50/1,218.72 = 402.16/x
  3. Step 3: Cross multiply
    813.50x = 1,218.72 × 402.16
  4. Step 4: Simplify right side
    813.50x = 490,120.44
  5. Step 5: Solve for x
    x = 490,120.44/813.50
  6. Step 6: Final answer
    x = 602.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.